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수직자기이방성을 갖는 [Pd/Co] Spin Valve 구조에서 자기저항효과
최진협(Jin-Hyup Choi),이기암(Ky-Am Lee) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.3
We have investigated the magnetoresistance (MR) effect of the spin valve structures composed of perpendicularly magnetized Pd/Co multilayers, with changing the space layer (Pd or Cu) thickness, the stacking number of the Pd/Co multilayers, and the Co insertion-layer thickness. The Cu space layer showed larger MR ratio than the Pd space layer. The Co insertion-layer between Cu layer and pinned layer enhanced the MR ratio about three times. The maximum MR ratio of 7.4 % was established in the sample with the Co insertion-layer thickness of 0.62 and 1.01 ㎚.
산화층 삽입에 따른 NiO / Co / Cu / Co 스핀밸브 박막의 열처리에 의한 자기적 특성
최상대(Sang-Dae Choi),주호완(Ho-wan Joo),최진협(Jin-hyup Choi),이기암(Ky-Am Lee) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.1
Magnetic properties are investigated for spin valves of Si/SiO₂/Ta(3 ㎚)/NiO(60 ㎚)/Co(2.5 ㎚)/Cu(1.95 ㎚)/ Co(4.5 ㎚)/NOL(tnm ; Nano Oxide layer)/Ta(3 ㎚) with annealing. The annealing effect of spin valves with NOL are shown larger MR ratios from 10 % to 12 %. However lower enhancement of MR ratios. The spin-valves with NOL also showed almost constant △R and smaller R. Enhanced MR ratios of spin valves with NOL after annealing result mainly from small values of R with constant △R which due to specular diffusive electron scattering at NOL(NiO)/metal interfaces.
Ta / NiFe / Cu / Co Pseudo 스핀밸브 구조의 자기저항 효과
주호완(Ho-wan Joo),최진협(Jin-hyup Choi),최상대(Sang-Dae Choi),이기암(Ky-Am Lee) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.1
The dependence of sensitivity, MR ratio, coercivity (Hc) and switching fields as a function of thickness of each magnetic layers (Co, NiFe and Cu) were investigated in pseudo spin valves with a structure of Ta/NiFe/Cu/Co. As measured results dependence of the thickness of each magnetic layer, we obtained MR ratio of 7.26% for Ta(4 ㎚)/NiFe(7.5 ㎚)/Cu(3 ㎚)/Co(5 ㎚) pseudo spin valves. Also, we could control properties of magnetoresistance for independent magnetization courses of each magnetic layer. Especially, we found that we could control coercivity as constant MR ratio dependence of Co thickness.
수직자기이방성을 갖는 [Pd/Ferromagnet] 다층막에서 표면자기이방성에 따른 교환력과 보자력의 의존성
허장(Jang Heo),김현신(Hyun-shin Kim),최진협(Jin-hyup Choi),이기암(Ky-am Lee) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.3
Dependence of the exchange bias and coercivity as surface magnetic anisotropy and ferromagnet materials for [Pd/Co]<SUB>N</SUB> and [Pd/Co,(CoFe)]<SUB>N</SUB>/FeMn multilayers with perpendicular magnetic anisotropy were investigated. The coercivity was proportionally increased to 670 Oe by increasing stack number N in Ta(2.1 ㎚)/[Pd(3.1/N)/Co(1.2/N)]<SUB>N</SUB>/Ta(2.1) multilayers with perpendicular magnetic anisotropy. Also, the coercivity in exchange biased multilayer was tend to increased by increasing stack number N. But coercivity of each materials have been in order of Co (600 Oe), Co?Fe? (520 Oe) and Co?Fe₂(320 Oe) as function of the ferromagnet materials. The other side, exchange force of each materials is 300 Oe when the reiteration layer number N is 3. In over number of reiteration layer 3, they maintained coercivity between 200 Oe and 300 Oe.